I've changed some key details below to avoid being identified, but am a very long-term member of MN.
I've two children with ExP. Youngest lives with me half time, eldest about 70% of the time.
Unti about a year ago, we had 50/50 shared care for both kids and therefore no child maintenance. School lunches, uniform, school items, birthday parties, phone contracts, were split 50/50 but he will often quibble about things, ask for further evidence, contest small charges, require explanation, etc, which is really frustrating and unnecessary. I'm mentioning this as I think it's probably relevant to why this is pushing my buttons and making me doubt myself.
About a year ago, eldest was very unhappy, and asked for a change in living arrangements -they have a much more strained relationship with ex than youngest does. Ex agreed with no quibble.
Now my eldest is here more often I have really noticed my costs rising. I waited for ex to offer something in acknowledgement, but nothing happened, so a few weeks ago, I asked for a regular additional contribution - didn't specify, just said, let's discuss, what do you think is reasonable, sort of thing? .
Cut to now, he is basically digging his heels in and wants me to itemise my additional costs before agreeing to pay anything. I really don't want this as I think it won't end well and my experience is he uses evidence seeking, numbers and things I've said as a means of control and prevarication. It's hard to explain...
What I want to do, is to suggest, eg, £200 per month (which is actually around half the amount CMS would require given his salary) plus a continuation of shared school expenses for each child.
Does that sound reasonable to you folk?
Reason for not going to CMS is because I think it would actually materially impact both eldest and youngest child. He's the higher earner, but not by much, and I know I would struggle massively to find £400 additionally per month. There is also a part of me that lives in fear of younger child opting to live with ExP, at some point - I think he would absolutely go for CMS in that situation, which would be his right of course.
How do other women in this situation learn to bash down that feeling they're on the make/ begging/ being too demanding? I'm so cross with myself. I'm a die-hard feminist, but when it comes to it I find it so hard to stand up for what I, and my kids, deserve. It doesn't help that I grew up in a culture where women just got on with it and expected very little of fathers.